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# Cto - [225.000 €/Anuales]

- **Company:** Subdiagonal
- **Location:** Castro-Urdiales, Spain
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Distributed Systems, PostgreSQL, Routing, Open Source Technology, Role-Based Access Control, Redis, Next.js, TypeScript, Management of Software Versions, ReactJS, Large Language Models, Caching, Backend, Fastapi, Terraform, Webhooks, Docker
- **Published:** August 27, 2026
- **Apply:** https://www.buscojobs.com.es/cto-225-000-%E2%82%AC-anuales-en-castro-urdiales-ID-369094772

## About the Role

No buscamos a alguien que solo sea de gestión.
Buscamos a alguien que sea muy técnico.
Con capacidad para construir arquitectura e infraestructura desde cero.
Qué vas a construir
AI Agents
Tool calling y structured outputs
Agent orchestration y sistemas multi-agent
Memory y context management
Human-in-the-loop
Evals, guardrails y observabilidad
Model routing, retries y fallbacks
LLM Infrastructure
OpenAI, Anthropic, Gemini y modelos open-source
RAG, embeddings y reranking
Semantic / hybrid search
Prompt & context versioning
Evaluación de calidad, latencia y coste
Backend & Distributed Systems
APIs y arquitecturas event-driven
Async workers, queues y webhooks
Multi-tenancy y RBAC
Idempotency, caching y failure recovery
Sistemas escalables y seguros
Platform Engineering
Construiremos primitives reutilizables para todos nuestros productos:
auth / organizations / billing / integrations / agents / workflows / search / evals / observability
StackPython · TypeScript · FastAPI · Node.
xqziphu js · React · Next.js · PostgreSQL · Redis · pgvector · Docker · Terraform · AWS/GCP · OpenTelemetry
LLMs: OpenAI · Anthropic · Gemini · open-source
Orquestación: LangGraph / custom orchestration · MCP · tool calling · RAG · eval frameworks

## Description

¿Interesado en saber más sobre este trabajo?Desplácese hacia abajo y descubra qué habilidades, experiencia y cualificaciones académicas se necesitan.Madrid · Full-time presencialidad no obligatoria******* € + Phantom SharesEl objetivo no es construir un departamento tecnológico enorme.Es construir un equipo pequeño, extremadamente técnico y AI-native, con uno de los mayores niveles de output por engineer del mercado.No buscamos a alguien que solo sea de gestión.Buscamos a alguien que sea muy técnico.Con capacidad para construir arquitectura e infraestructura desde cero.Qué vas a construirAI AgentsTool calling y structured outputsAgent orchestration y sistemas multi-agentMemory y context managementHuman-in-the-loopEvals, guardrails y observabilidadModel routing, retries y fallbacksLLM InfrastructureOpenAI, Anthropic, Gemini y modelos open-sourceRAG, embeddings y rerankingSemantic / hybrid searchPrompt & context versioningEvaluación de calidad, latencia y costeBackend & Distributed SystemsAPIs y arquitecturas event-drivenAsync workers, queues y webhooksMulti-tenancy y RBACIdempotency, caching y failure recoverySistemas escalables y segurosPlatform EngineeringConstruiremos primitives reutilizables para todos nuestros productos:auth / organizations / billing / integrations / agents / workflows / search / evals / observabilityStackPython · TypeScript · FastAPI · Node.xqziphu js · React · Next.js · PostgreSQL · Redis · pgvector · Docker · Terraform · AWS/GCP · OpenTelemetryLLMs: OpenAI · Anthropic · Gemini · open-sourceOrquestación: LangGraph / custom orchestration · MCP · tool calling · RAG · eval frameworks


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